<!DOCTYPE html>
<html>

<head lang="en">
  <meta charset="UTF-8">
  <title></title>
  <style type="text/css">
  a{
    color: green;
  }
  a:visited{

    color: red;
  }
  a:hover{

    color: yellow;
  }
  </style>

</head>

<body>


<a href="#">超链接各种状态演示</a>

</body>

</html>
